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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import sys
import os
import re
import shutil
import dataclasses
import subprocess
from typing import List
# ====
_MOUNT_PATH = "/bin/mount"
_FSTAB_PATH = "/etc/fstab"
# =====
@dataclasses.dataclass(frozen=True)
class _Storage:
mount_path: str
root_path: str
user: str
# =====
def _log(msg: str) -> None:
print(msg, file=sys.stderr)
def _find_storage(target: str) -> _Storage:
assert target
with open(_FSTAB_PATH) as fstab_file:
for line in fstab_file.read().split("\n"):
line = line.strip()
if line and not line.startswith("#"):
parts = line.split()
if len(parts) == 6:
options = dict(re.findall(r"X-kvmd\.%s-(root|user)=([^,]+)" % (target), parts[3]))
if options:
return _Storage(
mount_path=parts[1],
root_path=options.get("root", ""),
user=options.get("user", ""),
)
raise SystemExit(f"Can't find {target!r} mountpoint in {_FSTAB_PATH}")
def _remount(path: str, rw: bool) -> None:
mode = ("rw" if rw else "ro")
_log(f"Remounting {path} to {mode.upper()}-mode ...")
try:
subprocess.check_call([_MOUNT_PATH, "--options", f"remount,{mode}", path])
except subprocess.CalledProcessError as err:
raise SystemExit(f"Can't remount: {err}")
def _mkdir(path: str) -> None:
if not os.path.exists(path):
_log(f"MKDIR --- {path}")
try:
os.mkdir(path)
except Exception as err:
raise SystemExit(f"Can't create directory: {err}")
def _chown(path: str, user: str) -> None:
_log(f"CHOWN --- {user} - {path}")
try:
shutil.chown(path, user)
except Exception as err:
raise SystemExit(f"Can't change ownership: {err}")
# =====
def main() -> None:
if len(sys.argv) != 2 or sys.argv[1] not in ["ro", "rw"]:
raise SystemExit(f"Usage: {sys.argv[0]} [ro|rw]")
target = ""
dirs: List[str] = []
app = os.path.basename(sys.argv[0])
if app == "kvmd-helper-otgmsd-remount":
target = "otgmsd"
dirs = ["images", "meta"]
else:
raise SystemExit("Unknown application target")
rw = (sys.argv[1] == "rw")
storage = _find_storage(target)
_remount(storage.mount_path, rw)
if rw:
if storage.root_path:
for name in dirs:
path = os.path.join(storage.root_path, name)
_mkdir(path)
if storage.user:
_chown(path, storage.user)
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